2.67a Excretion in plants

2.67a Recall the origin of Carbon Dioxide and Oxygen as waste products of metabolism and their loss from the stomata of the leaf.

1) Equation for Photosynthesis: Co2 + H2o -----> C6H12O6 + O2
    The is an example of Excretion because the Oxygen here is a metabolic waste molecule.

2) Equation for Aerobic Respiration: C6H12O6 + O2 ----Enzymes----> ATP + CO2 + H2O
    The is an example of Excretion because the Carbon Dioxide here is a metabolic waste molecule.

So plants excrete oxygen and carbon dioxide depending on whether they are doing Photosynthesis or Respiration.